Fundraising Fox

Fourth Power

Massachusetts, US · Founded 2021 · 36 employees on LinkedIn · 4 known investors

Find your way into Fourth Power

1,170 people in our graph share verified history with the Fourth Power team — schools, employers, funds. One of them is your warm intro.

Kyle Dohertyunlockedknows Asegun Henry · together at Massachusetts Institute of Technology (overlapped)
×8knows the team · via Massachusetts Institute of Technology
knows the team · via Northwestern University
knows the team · via Georgia Institute of Technology
knows the team · via Advanced Research Projects Agency—Energy (ARPA-E)

Fourth Power develops thermal energy storage technology that converts electricity into heat for storage and back to electricity on demand, using high-temperature molten tin and thermophotovoltaic conversion. The company targets utility-scale and industrial applications for grid energy storage and decarbonization.

CleantechClimate TechDeep TechEnergy

Founders & leadership

Fourth Power was founded in 2021 by Asegun Henry.

AHAsegun Henry
Asegun HenryinFounder & Chief TechnologistAsegun Henry is a heat transfer researcher who completed his postdoctoral training at MIT and held faculty positions at Georgia Tech before founding Fourth Power. His prior research focused on solar fuels, thermochemistry, and phonon transport, including development of a high-temperature liquid metal pump, and he is now commercializing thermal energy storage technology developed over a decade in academic laboratories.
AGArvin Ganesan
Arvin GanesaninCEO

Investors · 4

Breakthrough Energy Ventures✓ verifiedBoston · $500K – $50M
DCVC (Data Collective)✓ verifiedPalo Alto · $5M – $25M
Munich Re VenturesreportedSan Francisco

Also in the syndicate · 1

Munich Re

Funding

SEC filings, press & company announcements

$40M disclosed across 2 rounds · 2025

Source: company announcements and press reports — follow each round's link for the claim.

In the news

Fourth Power makes the case for thermal storage as it raises $20 million - Energy Storageess-news.com · Sep 2025Non-lithium energy storage startups Fourth Power, Unbound Potential and XL Batteries raise financingenergy-storage.news · Sep 2025Bill Gates-backed Fourth Power raises USD 20m for thermal storage demo | Energy Storage News | Renewables Nowrenewablesnow.com · Sep 2025Fourth Power Raises $20M Series A Plus for Thermal Battery Techstartuphub.ai · Sep 2025Fourth Power Raises $20M in Series A Plus Fundingfinsmes.com · Sep 2025Fourth Power Raises $20 Million to Commercialize Low-Cost Utility-Scale Energy Storage Solution - Fourth Powergofourth.com · Sep 2025

Frequently asked questions

What does Fourth Power do?
Fourth Power develops thermal energy storage technology that converts electricity into heat for storage and back to electricity on demand, using high-temperature molten tin and thermophotovoltaic conversion. The company targets utility-scale and industrial applications for grid energy storage and decarbonization.
Who founded Fourth Power?
Fourth Power was founded by Asegun Henry in 2021.
Who are Fourth Power's investors?
Fourth Power's investors include Breakthrough Energy Ventures, DCVC (Data Collective), Munich Re Ventures.
How much funding has Fourth Power raised?
Fourth Power has disclosed $40M raised across 2 rounds.
Where is Fourth Power headquartered?
Fourth Power is headquartered in Massachusetts, US.